cli: Explicitly cast float to int, to silence MSVC warnings

This fixes these warnings:

tools/output/y4m2.c(82): warning C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
tools/output/y4m2.c(83): warning C4244: 'initializing': conversion from 'double' to 'int', possible loss of data
34 jobs for msvc-warnings in 4 minutes and 21 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Style
passed #437726
amd64 docker
style-check

00:00:14

passed #437727
amd64 docker
x86inc-check

00:00:14

 
  Build
passed #437738
amd64 docker
build-android-aarch64

00:00:19

passed #437737
amd64 docker
build-android-armv7

00:00:18

passed #437728
amd64 avx2 docker
build-debian

00:00:35

passed #437739
aarch64 docker
build-debian-aarch64

00:01:09

passed #437740
aarch64 docker
build-debian-aarch64-clang-5

00:00:57

passed #437743
armv7 docker
build-debian-armv7

00:00:44

passed #437744
armv7 docker
build-debian-armv7-clang-5

00:00:35

passed #437731
amd64 docker
build-debian-examples

00:00:26

passed #437746
ppc64le docker
build-debian-ppc64le

00:01:35

passed #437729
amd64 docker
build-debian-static

00:00:33

passed #437742
aarch64 docker
build-debian-werror

00:00:36

passed #437730
amd64 docker
build-debian32

00:00:34

passed #437741
macos
build-macos

00:00:47

passed #437747
amd64 docker
build-pages

00:00:15

passed #437745
amd64 docker
build-ubuntu-snap

00:00:29

passed #437735
amd64 docker
build-win-arm32

00:00:18

passed #437736
amd64 docker
build-win-arm64

00:00:19

passed #437732
amd64 docker
build-win32

00:00:37

passed #437733
amd64 docker
build-win32-unaligned-stack

00:00:35

passed #437734
amd64 docker
build-win64

00:00:49

 
  Test
passed #437748
amd64 docker
test-debian

00:00:47

98.2361%
passed #437757
aarch64 docker
test-debian-aarch64

00:02:07

passed #437759
armv7 docker
test-debian-armv7-clang-5

00:00:51

passed #437753
amd64 docker
test-debian-asan

00:01:29

passed #437749
avx2 amd64 docker
test-debian-asm

00:00:52

passed #437754
amd64 docker
test-debian-msan

00:00:56

passed #437751
amd64 docker
test-debian-mt

00:00:35

passed #437758
ppc64le docker
test-debian-ppc64le

00:01:32

passed #437755
amd64 docker
test-debian-ubsan

00:00:58

passed #437752
amd64 avx2 docker
test-debian-unaligned-stack

00:00:36

passed #437750
avx2 amd64 docker
test-debian32-asm

00:01:08

passed #437756
amd64 avx2 docker
test-win64

00:00:57